Hi @vrm ,
I'm afraid no OOTB way can remove the vertical scrollbar in Embed web part. You can provide your feedback here: https://feedbackportal.microsoft.com/feedback/forum/06735c62-321c-ec11-b6e7-0022481f8472.
As an alternative, have a try to inject custom CSS to the page using modern script editor web part to remove the scrollbar.
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